3.4.1 Compliance with 3.3 should be confirmed
by calculations which take into consideration the design characteristics
of the vessel, the arrangements, configuration and permeability of
the damaged compartments and the distribution, specific gravities
and the free surface effect of liquids.
3.4.2 The permeability of compartments assumed
to be damaged should be as follows:
|
Spaces
|
Permeability
|
|
|
|
| Appropriated to stores
|
60
|
| Occupied by accommodation
|
95
|
| Occupied by machinery
|
85
|
| Void spaces
|
95
|
| Intended for dry cargo
|
95
|
The permeability of tanks should be
consistent with the amount of liquid carried, as shown in the loading
conditions specified in 3.1. The permeability of empty tanks should
be assumed to be not less than 95.
3.4.3 The free surface effect should be calculated
at an angle of heel of 5° for each individual compartment, or
the effect of free liquid in a tank should be calculated over the
range of positive residual righting arm, by assessing the shift of
liquids by moment of transference calculations.
3.4.4 Free surface for each type of consumable
liquid should be assumed for at least one transverse pair of tanks
or a single centreline tank. The tank or tanks to be taken into account
should be those where the effect of free surface is the greatest.
3.4.5 Alternatively, the actual free surface effect
may be used provided the methods of calculation are acceptable to
the Administration.